i would like to use a trez dedk board to build raised garden beds for vegetables, isthe material safe to be exposed to soil?

Hello, and thank you for considering Trex decking! While the decking material will not leach any chemicals or harmful ingredients into the soil, we only have it approved for a horizontal walking surface. Being buried may cause some issues with warping or absorbing too much water over time. Kindly, Elisabeth-Trex Customer Care